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Vehicle On-Board Diagnostic System Check

NOTE: Test procedures are written specifically for General Motor's Tech 2 scan tool. A generic scan tool may not be capable of performing all necessary test functions.
  1. Connect scan tool to DLC. See COMPONENT LOCATIONS . Turn ignition on. If scan tool powers up, go to next step. If scan tool does not power up, go to TEST A: SCAN TOOL DOES NOT POWER UP under SYSTEM TESTS in appropriate BODY CONTROL MODULES article.
  2. Using scan tool, attempt to establish communication with Body Control Module (BCM). If scan tool communicates with BCM, go to next step. If scan tool does not communicate with BCM, go to TEST B: NO COMMUNICATION ON CLASS-2 SERIAL DATA LINK under SYSTEM TESTS in appropriate BODY CONTROL MODULES article.
  3. If no BCM DTCs exist, diagnose by symptom. See SYSTEM TESTS . If "U" type BCM DTCs exist, see appropriate BODY CONTROL MODULES article. If BCM DTCs other than "U" type exist, perform appropriate diagnostic test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  table.
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